Add-ons
Miscellaneous
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Mail Redirect
Requires Restart
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
ImportExportTools
Requires Restart
Adds some tools to import and export folders and messages
OverbiteFF
Requires Restart
Add legacy protocol support back to Firefox and SeaMonkey with OverbiteFF, which restores support for Gopher servers, plus CSO/ph searches, finger, whois and more! Cross-platform JavaScript runs anywhere Firefox does.
AutoProxy-ng
Requires Restart
This is a fork of AutoProxy, which can run the latest version of Firefox.
HostIP.info Geolocation Plugin
Requires Restart
Displays Geolocation information for a website using hostip.info data. Works with all versions of Firefox...
Share to Google+ Page
Requires Restart
Share to your Google+ Profile or Google+ Page with just click of a button.
Find In Textarea
SyncKolab
Requires Restart
SyncKolab can synchronize your calendar, address book and tasks against an IMAP server in Kolab formats version 1 (vCard/iCal) or version 2 (XML) or turn your Thunderbird/Lightning into a native Kolab Client (http://kolab.org).
Standalone SeaMonkey Mail
Use SeaMonkey as a standalone e-mail client. Set up a default browser for links opened from Mail & Newsgroups.
Mouse Gestures Suite
Requires Restart
Mouse gestures for SeaMonkey & Firefox: navigate & execute commands using mouse gestures (with single mouse button) and rocker gestures (by pressing 2 mouse buttons). Also: scroll wheel navigation, page scrolling, tab scrolling.
GNOMErunner/GTK for Seamonkey 2.x
Requires Restart
GNOMErunner/GTK - a classic unix theme for Seamonkey 2 (aka suiterunner)
using the GTK+ stock items and icons from the gnome iconset, resulting in a more consistent desktop integration on Unix.
TimerFox
Requires Restart
Easily counts down from a predefined number and alarms you when the count has reached zero.
AutoProxyMod
Focus Regainer
Requires Restart
Return focus from embedded object back to browser on browser hotkeys pressed.
Extension Auto-Installer
Important note: This extension will not work in Firefox 57 and above. Providing this functionality in Firefox is no longer possible, the extension is discontinued.
Addons Manager Hilite
Remembers last selected (hilited) extension/theme/plugin/userstyle in Add-ons Manager. Version 3.0 also includes sorting buttons. Turn off/on the add-on selection list box and/or fine tune behavior via its Options.
AutoCopy_rebirth
Requires Restart
Lightweight add-on that automatically copies any highlighted text to clipboard.
To create your own collections, you must have a Mozilla Add-ons account.
